Hi, so I know there are a bunch of email tracking websites out there where you can track whether your email has been read, when it was read, where it was read (IP address), how long they read your email, etc. I am interested in learning someone's location when they read my email (like what city they are in). However, this person primarily reads their email using their cell phone/Blackberry. I'm not familiar with IP addresses to know whether email tracking websites will still be able to tell the city the person is in if they are reading the email through their cell phone. So I just want to know if a cell phone's IP address stays the same or if it changes depending on their location (cell phone tower). How would this affect an email tracking program's ability to pin point where the person was geographically when they were reading it?